Concrete floor or slab-forming means



E. F. ALLBRIGHT.

CONCRETE FLOOR OR SLAB FORMING MEANS.

" APPLICATION FILED MAR-28.1918.

1,4;84L5QQ20 Patented m. 311, 119220 3 SHEETSSHEET I.

E. F. ALLBRIGHL CONCRETE FLOOR 0R SLAB FORMiNG MEANS.

APPLICATION FILED MAR- 28.

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M 5 mi E. F. ALLBRIGHT CONCRETE FLOOR 0R SLAB FORMING MEANS.

APPLICATION FILED MAR: 28, 1918.

1 Ac8%2%2 Patented Oct. 311, 1922.

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UNHTED STATES PATENT oTTTce.

EDWIN F. ALLBRIGHT, 01E ATLANTIC,

MASSACHUSETTS, ASSIGNOR, BY MESN 1E ASSIGN- MENTS, T0 GRID FLAT SLAB CORPORATION, OF BOSTON, MASSACHUSETTS, A COR- PORATION OF MASSACHUSETTS.

CONCRETE FLOOR OR SLAB-FORll/IING MEANS.

Application filed March 28, 1918. Serial No. 225,209.

To all whom it may concern Be it known that I, EDWIN F. ALLBRIGHT, a citizen of the United States, and resident of Atlantic, county of Norfolk and State of Massachusetts, have invented an Improvement in Concrete Floor or Slab-Forming Means, of which the following description, in connection with the accompanying drawings, is a specification, like Characters on the drawings representing like parts.

The invention hereinafter described relates to concrete construction, and more particularly to an improved system of forms and shoring for the concrete.

Heretofore, in the construction of cona complicated system of forms and shoring has been employed which requires a great amount of material and a great amount of labor and expense in placing the forms and shoring in position, and in removing the same from the concrete after it has been poured thereon and hardened. One of the objects of the present invention is to provide a simple and effective system of forms and shoring which may be quickly placed in position, and after the concrete has set for a short time, usually about two days, the forms and the main portion of the shoring may be quickly removed,leaving merely a small portion of the shoring to give adequate support'to the concrete during the period required for it to harden suiiiciently to permit the sup-port to be entirely removed. As a consequence, the shoring may be quickly moved from place to placeand progressively employed, thereby requiring a Small number offorms and a small amount in the production of a large area of concrete flooring, and rendering the forms and shoring available after use for a small period, such, for example, as two or three days, for removal to another field.

With the aforesaid and other objects in view, the character of the invention will be best understood by reference to the following description of one good form thereof the accompanying drawings,

of shoring wherein:

Figure 1 is a plan of a system of forms and shoring which may be used in the production of a floor or slab supported on columns;

which may receive hooks or other Fig. 2 is a vertical section through a portion of a floor, and forms and shoring therefor;

Fig. 3 on an enlarged scale is a vertical sect onal view showing a portion of a concrete slab supported by a pair of domed forms with shoring in position beneath the same;

Fig. 4.- is a. perspective view of one of the domed forms;

Fig. 5 isa vertical section through the form shown in Fig. 4;

Fig. 6 is a vertical section taken on line 6-6 of Fig. 1 through a pair of special forms and their supporting means;

Fig. 7 is a plan of a group of four forms showing devices for temporarily securing the same to the shoring;

Fig. 8 is a perspective View of one of the posts and its cap for supporting a portion of the slab located between columns, and stringers supported by the posts and ig. 9 is a perspective view of a portion of the system of shoring.

Referring to the drawings, the concrete construction shown therein comprises columns 1 having capitals 3 surmounted by depressed panels 5 supporting a floor or slab includin solid concrete areas 7 integral with an areav 9 between said areas 7 andhaving a series of domes or recesses 11 in the under side thereof. The concrete construction just described may be substantially the same as that shown in my United States Patent No. 1,307,031, granted J une 17. 1919.

Next will be described a system of forms and shoring embodying the invention which may be used in the production of the floor or slab described. This system, in the present instance,v comprises an assembly of forms 13 (Fig. 4) of steel, indurated fiber or other suitable material, preferably having a smooth surface which may receive a coating of oil before the concrete is poured thereon. Each of these forms may have a substantially square base with a flange 15 projecting outwardly therefrom and surrounding the same. The body of the form preferably is domed or recessed to produce an arch-like effect. Opposite sides of the form may have recesses 17 formed therein presenting ledges devices rest on brackets concrete after the latter spreading the flanges of the forms.

the forms from the has set or hardened to facilitate removal of sufliciently.

An assembly of forms such as described may be positioned with the flanges of adjacent forms in engagement with one another, so that the concrete may be poured on and around the same, thereby producing concrete ribs 19 between the forms and a solid area 20 above the forms.

Next will be described means for supporting the forms. To accomplish this, in the present instance, members 21 may be provided, each being of a width such that it may support the meeting flanges of two adjacent rows ot forms. These stringers may extend in parallel relation and be distributed to furnish support for the forms in accordance with their location and disposition.

Suitable means may be provided to support the stringers 21. In the present instance, this means comprises a series of joists or members 23 extending transversely of the stringers 21 beneath the same. The joists 23 may be arranged 1n pairs on opposite sides of posts 25 (Figs. 1 and 8) preferably located in rows midway between adjacent columns. The pairs of joists may rest intermediate their ends on brackets 27 detachably secured by bolts 29 to opposed sides of the posts 25. The ends of the joists adjacent opposed edges of the dropped panels may 31 detachably secured by bolts 33 to posts 35; and the ends of stringers adjacent the other edges of the dropped panels may be supported by joists 37 resting on brackets 39 detachably secured by bolts 41 to posts 48. It will be understood, however, that the pairs of joists and the posts may be variously located to support the load thereon as required.

The pairs of forms above said. posts 25 may have depending flange portions 45 Fig. 6) at opposite sides of blocks or caps 47 fast on the tops of said posts, said flange portions being secured to said blocks by doubleheaded nails 49 driven through holes in said flange portions and into said blocks, the latter being of the width of the ribs to be produced between the adjacent sides of the forms.

To contribute to the proper positioning of the forms on the stringers while the concrete is poured on the forms, suitable devices may be provided, in the present instance, in the form of metal disks 51 (Fig. 7), each overlapping the corners of four adjacent forms, said disks being secured to the stringers by nails 53 passing through holes in the centers of the disks and thence between the corners of the flanges of the adjacent forms, said corners being rounded somewhat to allow the nails to pass between them without These a series of stringers or a width corresponding to disks may also serve to assist removal of the forms from the concrete when the stringers are taken down as more fully hereinafter described.

Suitable means may be provided to produce the dropped panels, in the present instance, forms 55 (Figs. 1 and 9) of wood or other suitable material being provided for this purpose. These forms 55 may have an inner edge contour conforming to the shape of the capital of the column, and outer edges conforming to the shape of the dropped panel, which in the present instance, is of rectangular form. The forms 55 may each be made of two par-ts as noted in Fig. 1 to facilitate placing and removal thereof.

The ends of the forms 55 may be supported on joists 57 resting on brackets 59 detachably secured by bolts 61 to the posts 43 referred to. The edges of the dropped panel may be formed by the opposed stringers 63 and by boards 65 secured by double-headed nails 6? to the stringers 63.

The span between adjacent columns, or the span between a column and a wall, may be such that the forms will not equally divide the same. In such case a filler or fillers 15 (Fig. 3) may be provided to increase the effective width of the flange of the form and be scribed, the posts are set up, the joists are mounted on the brackets, the stringers are mounted on the joists, and the domed forms aredistributed and placed with their flanges resting on the stringers, said forms being secured to the stringers by placing the disks over the corners of the flanges and driving nails through said. disks into the stringers as described. The forms for the dropped panels are mounted on their supporting joists, and then the forms and shoring are in position in readiness to have the concrete poured on and about the forms.

After the concrete has been poured and has set and hardened for a short period, such, for example, as two or three days, the brackets are removed from the posts, and the joists are removed from the posts. This will allow the joists and stringers to be readily lowered from their positions in which they support the domed forms. The forms may then be readily withdrawn from the concrete. In case they should adhere thereto. they may be separated from the concrete by applying hooks or other suitable means to the recesses 17 in the walls of the forms, and pulling the saine downward. Before the pairs of domed forms having depending flange portions may be removed, the doubleheaded nails 49 are withdrawn therefrom' and from the blocks 47.

After all of the forms have been removed. the posts 25 will remain standing, and the blocks 47 thereon will furnish adequate support for the portions of the slab intermediate the columns during the remainder of the period, such, for example, as two or three weeks, required for the floor or slab to harden completely. Then the blocks 47 and posts may be quickly removed therefrom.

Thus, by the system of forms and shoring very small. The saving in material required for the forms and stringers, and the speed with which the forms and shoring may, be placed and removed, effect a great economy in the construction of the floor or slab. The forms not only enable a great economy in the forms and shoring required, but also a great saving in the amount of concrete required in the production of the fioor or slab, as has been pointed out in my copending application.

An important feature of the invention consists in the provision of the flanges projecting outward from the bodies of the. forms, since they enable the forms to be quickly and readily placed without care being given to the spacing thereof, as this is determined by merely assembling the forms with the edges of their flanges in engagement with each other. The flanges will antomatically determine the width of the ribs of concrete between the bodies of adjacent forms, without the necessity of providing.

separate forms between adjacent forms, and without the necessity of locating such separate forms.

There is a further important advantage in the provision of the outward projecting flanges on the forms. They make possible the use of the very simple system of shoring described for supporting the forms. It will. be noted that two complete rows of forms may be supported by merely three stringers, the intermediate stringer serving both rows of forms, and the other stringers also contributing to the support of two more rows of forms.

The system of joists, strin ers and forms described constitute means or supporting the concrete for but a brief period, and the posts with blocks interposed between certain of the forms furnish adequate support for the concrete bays for the necessary period for hardening after the said temporary support is removed. Since the concrete is poured directly onto the blocks on the posts, it is unnecessary to leave forms above the posts after the other forms have been removed, but on the contrary, all of the forms are available for use in the production of other concrete areas.

The posts with their blocks may remain in position to furnish support for the posts of shoring for upper floors, which posts may be placed above and directly in line with the posts for the. lower floor to receive direct support therefrom. Thus, the construction of successive floors may progress rapidly with the use of a small number of forms and a small amount of shoring.

While the stringers, joists, posts, etc, of the shoring are shown herein as of wood, it will be understood that they may be of steel if desired. Therefore, the terms,stringers and joists in the claims are to be regarded as generic to any suitable material.

It will be understood that the invention.

is not limited to the specific embodiment shown, but that various deviations may be made therefrom without departing from the spirit and scope of the appended claims.

'VVhat is claimed is 1. Concrete forming means, comprising, in combination, an assembly of domed forms for producing a deeply paneled slab, each, of said forms having a top, sides and a continuous flange surrounding the base of the form, said parts constituting a rigid, selfsustaining form, the assembly of forms being disposed with their base flanges determining the spacing of the forms in transverse rows, and means temporarily to'support said forms having provision, for removing said forms after concrete placed on and between the forms has hardened.

2. A. form for producing a concrete floor or slab, comprising a hollow domed body having a flange projecting outward therefrom, and means in said body adapted to be engaged to dislodge the form from the concrete.

3. Concrete forming means, comprising in combination, an assembly of domed forms for producing paneled slabs; each of the forms having a top and outwardly flaring sides disposed to simulate a frustum of a.

pyramid having a continuous fiat flange surrounding the base of the form, and the parts constituting a. rigid self-sustaining form, the assembly of forms being disposed with their base flanges abutting one another to determine the spacing'o-f the forms in rows; and shoring for the forms including spaced stringers engaging the flanges upon two sides of each form and constituting the sole supporting means upon which the forms rest.

4. Concrete floor forming means for the production of a concrete floor having column supported solid panels projectingjsubst-an tial distances beyond the columns with cantilever effect, and recessed'panels extending between and supported by the solid panels;

comprising forms for producing the solid panels, and an assembly of domed forms for producing the recessed panels each of the domed forms having a closed upper end and a. continuous outwardly extending flange surrounding its lower end; and shoring for temporarily supporting the forms including spacing stringers engaging the flanges upon two sides of each domed form and constituting the sole support upon which the forms rest.

5. Concrete forming means, comprising, in combination, an assembly of rigid, selfsustaining domed forms for producing paneled slabs; including similar domed forms each having a continuous, laterally-extending flange surrounding-the base of the form,

and other domed forms each having a down- Wardly-extending flange upon one side thereof, the assembly of forms being disposed with their base flanges abutting one another to determine the spacing of the forms in rows, shoring for temporarily supporting the forms including spaced stringers engaging the flanges of the "forms and constituting the sole supporting means upon which the forms rest, a concrete engaging block disposed between the downwardly-extending flanges of said other forms, and means for maintaining the block in supporting engagement with the concrete after the domed forms are removed- In testimony whereof, I have signed my name to this specification.

EDWIN F. ALLBRIGHT. 

